[teiid-issues] [JBoss JIRA] (TEIID-5763) GENERATED_KEY returns NULL if used in INSTEAD OF INSERT Triggers in DDL files

[Steven Hawkins (Jira)]

    [ https://issues.jboss.org/browse/TEIID-5763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13747509#comment-13747509 ] 

Steven Hawkins commented on TEIID-5763:
---------------------------------------

An odata exception such as "{"error":{"code":null,"message":"TEIID16016 Insert into QuicklyAddedProducts success, but failed to retrieve auto generated keys from source, thus failed to show result entity; Supply the key values."}}" is what I was mentioning as issue 3.

It requires that the key value is explicitly set:

CREATE TRIGGER ON QuicklyAddedProducts INSTEAD OF INSERT AS
	FOR EACH ROW 
	BEGIN ATOMIC
   		DECLARE long vIdProduct;
		
		INSERT INTO 
			Products(fkDatabaseKey)
		VALUES
			(2);
		
		vIdProduct = generated_key();--CONVERT(GENERATED_KEY('idProduct'),long);

		-- create a new record for the quickly added product
		INSERT INTO 
			QuicklyAddedProducts_SRC(fkProduct, fkProfile, product_name, energy_100g, carbohydrates_100g, proteins_100g, fat_100g)
		VALUES
			(vIdProduct, new.fkProfile, new.product_name, new.energy_100g, new.carbohydrates_100g, new.proteins_100g, new.fat_100g);
		
		*key.fkProduct = vIdProduct;*
	END;

And unintuitively for the view auto increment column to be not null:

CREATE VIEW QuicklyAddedProducts (fkProduct long *NOT NULL* AUTO_INCREMENT ...

After that things seem to work fine.

I'll make another commit under this issue to not require the not null on the auto_increment.

> GENERATED_KEY returns NULL if used in INSTEAD OF INSERT Triggers in DDL files
> -----------------------------------------------------------------------------
>
>                 Key: TEIID-5763
>                 URL: https://issues.jboss.org/browse/TEIID-5763
>             Project: Teiid
>          Issue Type: Bug
>    Affects Versions: 12.2
>            Reporter: Christoph John
>            Assignee: Steven Hawkins
>            Priority: Blocker
>
> The issue arrised in:
> https://developer.jboss.org/message/989700#989700
> Following sceanarios are  given:
> Variant 1:
> Table Product(id), primary key = autoincrement;
> Table QuicklyAddedProduct, primary key is foreign key on Product.id
> Table Diary_SRC
> View Diary on Diary_SRC
> INSTEAD OF INSERT Trigger on Diary should :
> -create new record on Product, 
> -get autoincremented Product.id of new record,
> - create new QuicklyAddedProduct with returned Product.id as primary key
> - create new Diary record with QuicklyAddedProduct 
> {
>    INSERT a new record on Product;
>    idProduct = CONVERT(GENERATED_KEY('idProduct'),long); // fails
> }
> Variant 2:
> INSTEAD OF INSERT trigger on Diary should :
> - create new QuicklyAddedProduct 
> - add Quickly added prodcut to Diary
> additionally a INSTEAD OF trigger on QuicklyAddedProduct exists which:
> - creates new Product record
> - uses returned GENERATED_KEY(Product.id) to add record on QuicklyAddedProduct with Product.id as primary key



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